Presidium® Diamond Mate A/C Diamond Tester

The Presidium Diamond Mate A/C is a compact handheld diamond tester designed to instantly verify the authenticity of diamonds. Using thermal conductivity testing, the device distinguishes real diamonds from common simulants such as cubic zirconia and glass.

The tester features a retractable thermoelectric probe tip that maintains consistent pressure against the gemstone during testing, helping ensure accurate and reliable results. With an ultra-thin 0.6 mm probe tip, the Diamond Mate can test diamonds as small as 0.02 carats, making it suitable for both loose stones and mounted jewelry.

Results are displayed instantly through LED indicator lights and audible signals, allowing jewelers, pawn shops, and gemstone buyers to quickly confirm whether a stone is a diamond.

Key Features

• Thermal conductivity diamond testing

• Instantly verifies real diamonds vs simulants

• Retractable probe tip for improved accuracy

• 0.6 mm probe tip for testing stones as small as 0.02 ct

• LED display and audible signals for clear results

• Metal alert buzzer to indicate contact with jewelry settings

• No waiting time between tests

• Low battery indicator and low power consumption

Available Versions

The Diamond Mate tester is available in two configurations:

• PDMT-A – Powered by 3 AAA batteries

• PDMT-C – Rechargeable battery with AC adapter

Applications

• Verifying genuine diamonds

• Identifying diamond simulants such as cubic zirconia

• Jewelry appraisal and repair

• Pawn shop gemstone testing

• Screening loose and mounted stones

Product Specifications

• Brand: Presidium®

• Model: Diamond Mate A/C (PDMT-A / PDMT-C)

• Testing Method: Thermal conductivity

• Minimum Stone Size: 0.02 ct

• Probe Tip Size: 0.6 mm

• Display: LED indicator with audio signal

• Power: AAA batteries or rechargeable battery with AC adapter

⚠️ Important Note:
Thermal diamond testers like the Diamond Mate cannot distinguish moissanite from diamond, because both have similar thermal conductivity. A tester with electrical conductivity (such as the Presidium Multi Tester III) is required for that distinction.